Radio communication system and communication control method
A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.
1 . A method for a communication apparatus, the method comprising:
communicating with a user equipment; and
transmitting a parameter to the user equipment,
wherein an initialization value for scrambling a bit of a control channel which is different from a physical downlink control channel (PDCCH) is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
2
9
+
N
1
,
where the C init,1 is the initialization value, the n s is a slot number within a radio frame and the N 1 is the parameter.
2 . The method according to claim 1 ,
wherein the parameter is included in an enhanced physical downlink control channel (EPDCCH) configuration.
3 . The method according to claim 1 ,
wherein the parameter is transmitted by Radio Resource Control (RRC) signaling.
4 . The method according to claim 1 , further comprising:
scrambling the bit of the control channel based on the initialization value; and
transmitting, in the control channel to the user equipment, a scrambled bit of the control channel which is scrambled based on the initialization value.
5 . The method according to claim 1 ,
wherein the initialization value for scrambling the bit of the control channel is a first initialization value,
wherein the formula is a first formula,
wherein the first formula is different from a second formula of a second initialization value,
wherein the second initialization value is for scrambling a bit of the PDCCH, and
wherein the second formula of the second initialization value is defined as follows:
C
init
,
2
=
⌊
n
s
2
⌋
2
9
+
N
2
,
where the C init,2 is the second initialization value, the n s is the slot number within the radio frame, and the N 2 is a cell identity (ID).
6 . The method according to claim 1 ,
wherein the communication apparatus is a base station.
7 . The method according to claim 1 ,
wherein a resource is reserved for the control channel.
8 . The method according to claim 1 , further comprising:
reserving a resource for the control channel.
9 . The method according to claim 1 ,
wherein the control channel is an enhanced physical downlink control channel (EPDCCH).
10 . A method for a user equipment, the method comprising:
communicating with a communication apparatus; and
receiving a parameter from the communication apparatus,
wherein an initialization value for scrambling a bit of a control channel which is different from a physical downlink control channel (PDCCH) is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
2
9
+
N
1
,
where the C init,1 is the initialization value, the n s is a slot number within a radio frame and the N 1 is the parameter.
11 . The method according to claim 10 ,
wherein the parameter is included in an enhanced physical downlink control channel (EPDCCH) configuration.
12 . The method according to claim 10 ,
wherein the parameter is transmitted by Radio Resource Control (RRC) signaling.
13 . The method according to claim 10 , further comprising:
receiving, in the control channel from the communication apparatus, a scrambled bit of the control channel which is scrambled based on the initialization value.
14 . The method according to claim 10 ,
wherein the initialization value for scrambling the bit of the control channel is a first initialization value,
wherein the formula is a first formula,
wherein the first formula is different from a second formula of a second initialization value,
wherein the second initialization value is for scrambling a bit of the PDCCH, and
wherein the second formula of the second initialization value is defined as follows:
C
init
,
2
=
⌊
n
s
2
⌋
2
9
+
N
2
,
where the C init,2 is the second initialization value, the n s is the slot number within the radio frame, and the N 2 is a cell identity (ID).
15 . The method according to claim 10 ,
wherein the communication apparatus is a base station.
16 . The method according to claim 10 ,
wherein a resource is reserved for the control channel.
17 . The method according to claim 10 ,
wherein the control channel is received based on a resource which is reserved for the control channel.
18 . The method according to claim 10 ,
wherein the control channel is an enhanced physical downlink control channel (EPDCCH).
19 . A communication apparatus comprising:
at least one memory; and
at least one hardware processor coupled to the at least one memory,
wherein the at least one hardware processor is configured to:
transmit a parameter to a user equipment,
wherein an initialization value for scrambling a bit of a control channel which is different from a physical downlink control channel (PDCCH) is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
2
9
+
N
1
,
where the C init,1 is the initialization value, the n s is a slot number within a radio frame and the N 1 is the parameter.
20 . A user equipment comprising:
at least one memory; and
at least one hardware processor coupled to the at least one memory,
wherein the at least one hardware processor is configured to:
receive a parameter from a communication apparatus,
wherein an initialization value for scrambling a bit of a control channel which is different from a physical downlink control channel (PDCCH) is based on a formula as follows:
C
init
,
1
=
⌊
n
s
2
⌋
2
9
+
N
1
,
where the C init,1 is the initialization value, the n s is a slot number within a radio frame and the N 1 is the parameter.